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• Copyright (C) 2004- 2005 Stelian Pop <stelian@popies.net>
• Copyright (C) 2007 Mattia Dongili <malattia@linux.it>

This mini-driver drives the SNC and SPIC device present in the ACPI BIOS of theSony Vaio laptops. This driver mixes both devices functions under the same(hopefully consistent) interface. This also means that the sonypi driver isobsoleted by sony-laptop now.

Fn keys (hotkeys):¶

Some models report hotkeys through the SNC or SPIC devices, such events arereported both through the ACPI subsystem as acpi events and through the INPUTsubsystem. See the logs of /proc/bus/input/devices to find out what thoseevents are and which input devices are created by the driver.Additionally, loading the driver with the debug option will report all eventsin the kernel log.

The “scancodes” passed to the input system (that can be remapped with udev)are indexes to the table “sony_laptop_input_keycode_map” in the sony-laptop.cmodule. For example the “FN/E” key combination (EJECTCD on some models)generates the scancode 20 (0x14).

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Backlight control:¶

If your laptop model supports it, you will find sysfs files in the/sys/class/backlight/sony/directory. You will be able to query and set the current screenbrightness:

Platform specific:¶

Loading the sony-laptop module will create a/sys/devices/platform/sony-laptop/directory populated with some files.

You then read/write integer values from/to those files by usingstandard UNIX tools.

The files are:

Note that some files may be missing if they are not supportedby your particular laptop model.

Example usage:

sets the lowest screen brightness for the next and later reboots

sets the highest screen brightness for the next and later reboots

retrieves the value

powers off the sound card

powers on the sound card.

RFkill control:¶

More recent Vaio models expose a consistent set of ACPI methods tocontrol radio frequency emitting devices. If you are a lucky owner ofsuch a laptop you will find the necessary rfkill devices under/sys/class/rfkill. Check those starting with sony-* in:

Development:¶

If you want to help with the development of this driver (andyou are not afraid of any side effects doing strange things withyour ACPI BIOS could have on your laptop), load the driver andpass the option ‘debug=1’.

REPEAT:

DON’T DO THIS IF YOU DON’T LIKE RISKY BUSINESS.

In your kernel logs you will find the list of all ACPI methodsthe SNC device has on your laptop.

• For new models you will see a long list of meaningless method names,reading the DSDT table source should reveal that:

1. the SNC device uses an internal capability lookup table
2. SN00 is used to find values in the lookup table
3. SN06 and SN07 are used to call into the real methods based onoffsets you can obtain iterating the table using SN00
4. SN02 used to enable events.

Some values in the capability lookup table are more or less known, seethe code for all sony_call_snc_handle calls, others are more obscure.

• For old models you can see the GCDP/GCDP methods used to pwer on/offthe CD drive, but there are others and they are usually different frommodel to model.

I HAVE NO IDEA WHAT THOSE METHODS DO.

The sony-laptop driver creates, for some of those methods (the mostcurrent ones found on several Vaio models), an entry under/sys/devices/platform/sony-laptop, just like the ‘cdpower’ one.You can create other entries corresponding to your own laptop methods byfurther editing the source (see the ‘sony_nc_values’ table, and add a newentry to this table with your get/set method names using theSNC_HANDLE_NAMES macro).

Your mission, should you accept it, is to try finding out whatthose entries are for, by reading/writing random values from/to thosefiles and find out what is the impact on your laptop.

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Should you find anything interesting, please report it back to me,I will not disavow all knowledge of your actions :)

See also http://www.linux.it/~malattia/wiki/index.php/Sony_drivers for otheruseful info.

Bugs/Limitations:¶

• This driver is not based on official documentation from Sony(because there is none), so there is no guarantee this driverwill work at all, or do the right thing. Although this hasn’thappened to me, this driver could do very bad things to yourlaptop, including permanent damage.
• The sony-laptop and sonypi drivers do not interact at all. In thefuture, sonypi will be removed and replaced by sony-laptop.
• spicctrl, which is the userspace tool used to communicate with thesonypi driver (through /dev/sonypi) is deprecated as well since allits features are now available under the sysfs tree via sony-laptop.

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